667901872 has 20 divisors (see below), whose sum is σ = 1411702056. Its totient is φ = 303591680.

The previous prime is 667901869. The next prime is 667901879. The reversal of 667901872 is 278109766.

It is a happy number.

It is a super-2 number, since 2×667901872² = 892185821242208768, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (667901879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1897273 + ... + 1897624.

Almost surely, 2^667901872 is an apocalyptic number.

It is an amenable number.

667901872 is an abundant number, since it is smaller than the sum of its proper divisors (743800184).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

667901872 is a wasteful number, since it uses less digits than its factorization.

667901872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3794916 (or 3794910 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 667901872 is about 25843.7975537652. The cubic root of 667901872 is about 874.1196574910.

The spelling of 667901872 in words is "six hundred sixty-seven million, nine hundred one thousand, eight hundred seventy-two".